TRACTIVE CHARACTERISTICS OF DC LINEAR MOTOR WITH A CONSTANT VOLTAGE APPLIED TO GROUND COIL

The tractive characteristics of the dc linear motor with normal conducting magnets aboard the train are discussed. The ground coils are assumed to be excited with a constant voltage. The main conclusions follow. The self-inductance of the ground coil varies with time because the magnetic poles aboard the train move facing the ground coils. Hence, the coil current decreases as train speed increases, resulting in reduction of the tractive force. Ground coil current must be limited in order to prevent the magnetic core aboard the train from being saturated. Hence, the exciting voltage should be kept as low as several hundred volts. Tractive force required to drive the train at 500 km/h is obtainable by mounting multiple magnets on each car. From the standpoint of levitation force, the magnetic pole should have a horizontal length of about 20 m. This is excessively long because each car is at most 25 m long. Further, as Earnshaw's theorem suggests, some feedback control is indespensable for stabilizing the levitation height.

  • Availability:
  • Corporate Authors:

    Scripta Publishing Corporation

    Investment Building
    Washington, DC  United States  20005
  • Authors:
    • Amemiya, Y
    • Aiba, S
  • Publication Date: 1974-9

Media Info

  • Features: References;
  • Pagination: p. 97-103
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00129101
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Feb 19 1976 12:00AM